Cash is just another asset class, and since becoming a pure fiat it’s never been a good one: https://fred.stlouisfed.org/series/CPIAUCSL

Given the fiscal dominance we’re in now that pretty much guarantees higher rates of inflation in the future, I think there’s much better places to place your money if you want to diversify. At least cash equivalents would be better

The parent comment is probably just talking about temporarily timing the bubble pop.